Edwin c



(No Model.)

E. C. PALMER 36 S. G. RYDER.

- REVOLVING EMERY WHEEL DRESSER.

No. 448,787. Patented Mar. 24, 1891 Srarns Arnr anion.

EDlVIN O. PALMER AND SUMNER G. RYDER, OF CLEVELAND, OHIO, ASSIGNORS TO THE STANDARD TOOL COMPANY, OF SAME PLACE.

REVOLVING EMERY-WHEEL DRESSER.

SPECIFICATION forming part of Letters Patent No. 448,787, dated March 24, 1891. Application filed August 11, 1890. Serial No. 361,658. (No model.)

To aZZ whom it may concern.-

Be it known that we, EDWIN O. PALMER and SUMNER G. RYDER, citizens of the United States, and residents of Cleveland, county of Ouyahoga,State of Ohio, haveinvented certain new and useful Improvements in Emery- IVheel Dressers, of which we hereby declare the following to be a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to improvements in revolving emery-wheel dressers, and it is designed to be equally adapted to operate upon smaller sizes of emery-wheels as well as upon larger wheels. Its object is also to produce a more solid, immovable, and resisting foundation to wear than has hitherto been in use, and to present a constant cutting-edge to the wheel to be operated upon.

Our invention consists in arevolving cylinder of hardened metal-such as cast-steelmounted upon a suitable spindlebearing and provided with radially-driven cavities 011 its periphery arranged in close proximityin such a manner as to leave thin intervening edges between the cavities, and in the details of construction and manner of arrangement of the various parts, as shown in the drawings, described in the specification, and more particularlypointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective view of our improved cutter. Fig. 2 is a vertical cross-section of a tool through the spil'idle-bearin Fig. 3 is a perspective view of the cylinder detached, with a diagonal section cut through 0c :r, Fig. 1. Figs. 4 and 5 are surface elevations of cuttercylinder, showing cross-cuts on their peripheries.

A in the drawings shows a forked handle, provided with spindle-bearings a Ct, between which is mounted the cutting-cylinder 13 upon the spindle O. This spindle O is secured within the bearings a and ct by the setscrew a lleretofore difficulty has been experienced in obtaining substantial cutters for this purpose, since many have been made in detached sections or disks strung upon a spindle, which.

are constantly passing one another in motion, and a varying surface is presented to the wheel, no permanent cavities-bein g obtained. In our invention greater solidity is obtained with continuous sharpness of edge, and in one direction, as shown in section diagonally, as in Fig. 3, the walls are seen to be perfectly straight from tip to base, thus wearing down evenly until worn to the hub. The thicker portions connecting these membranes serve to support the parts and solidify the cutter. If drilled with a straight drill, there will be a slight taper of the walls, but not enough to interfere with usefulness; but, preferably, the drill-holes are reamed out with a taper reamer. One of the chief advantages of our invention is the fact that a number of tools can be cut from one cylindrical rod of steel or chilled iron. The separate sections are then centrally bored to receive the spindle, and the holes in the periphery can be drilled quickly and a number of them simultaneously. They are then. ready to mount upon spindles. Deep-seated grooves, as D, may be sawed in different directions about the periphery to aid in breaking up the surface.

What we claim, therefore, as new, and desire to secure by Letters Patent, is-

1. In an emery-wheel dresser,asolid cylindrical cutter bored longitudinally to receive a central spindle and from the periphery radially toward the hub to form cutting-edges, substantially as described.

2. In an emery-wheel dresser, a solid. cylindrical cutter in one piece bored longitudinally to receive a central spindle and radially from the periphery to the hub to form cutting-edges, said radial borings being arranged regularly and in close juxtaposition to form separating membranes 1) of unvarying thickness from edge to base, substantially as described.

A solid cylindrical cutter provided with a central longitudinal spindle-bearing, radial borings extending from the periphery toward the center, but leaving a thickened portion for a hub, thick and thin membranes separating the cavities, the thin membranes havin g substantially parallel sides, and a suitable spindle for the same, substantially as (le- 1 in eonibii'iation with deep-seated slnts upon scribed. the periphery, substantially as described.

l. A solnl cylnnlrieal cutter lor lressing EDWIN u PALMER emery-Wheels centrallv and lOnQllllCllllZtllY v 7,1 r y bored to lOCOlYC a spindle, and provided with radial and permanent cavities extending from lv'it nesses: the periphery toward the central cavitysuffi- WM. Al. Moxnolc, eient Space being left integral to forma huh Emu L. JONES. 

